<?php
namespace common\models;

//验证码类
class ValidateCode {
        private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
        private $code;//验证码
        private $codelen = 4;//验证码长度
        private $width = 130;//宽度
        private $height = 50;//高度
        private $img;//图形资源句柄
        private $font;//指定的字体
        private $fontsize = 20;//指定字体大小
        private $fontcolor;//指定字体颜色
        //构造方法初始化
        public function __construct() {
         $this->font = dirname(__FILE__).'/font/Elephant.ttf';//注意字体路径要写对，否则显示不了图片
//         print_r($this->font);die();
        }
        //生成随机码
        private function createCode() {
         $_len = strlen($this->charset)-1;
         for ($i=0;$i<$this->codelen;$i++) {
          $this->code .= $this->charset[mt_rand(0,$_len)];
         }
//         print_r($this->code);die();
        }
        //生成背景
        private function createBg() {
         $this->img = imagecreatetruecolor($this->width, $this->height);
         $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
         imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
        }
        //生成文字
        private function createFont() {
         $_x = $this->width / $this->codelen;
         for ($i=0;$i<$this->codelen;$i++) {
          $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
          imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
         }
        }
        //生成线条、雪花
        private function createLine() {
         //线条
         for ($i=0;$i<6;$i++) {
          $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
          imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
         }
         //雪花
         for ($i=0;$i<100;$i++) {
          $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
          imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
         }
        }
        //输出
        private function outPut() {
         header('Content-type:image/png');
         imagepng($this->img);
         imagedestroy($this->img);
        }
        //对外生成
        public function doimg() {
//         $this->createBg();
         $this->createCode();
//         $this->createLine();
//         $this->createFont();
//         $this->outPut();
        }
        //获取验证码
        public function getCode() {
         return strtolower($this->code);
        }
}
?>